Sorry for the inconvenience but you don't have to install anything to play it or even extract from zip folder. The ReadMe .txt says that.
At the moment the game is built on an old engine because i find it easier to arrange room levels there but I intend to transfer the game to an updated version of the engine. This is why you get prompted to install DirectPlay which is an old Windows component.
You can uninstall DirectPlay from 'Legacy Components'.
Thank you for playing.